Move content template into base.html

docs/theme/content.html

-{% if meta.source %}
-
-  {% for filename in meta.source %}
-    <a class="github" href="https://github.com/tomchristie/django-rest-framework/tree/master/rest_framework/{{ filename }}">
-      <span class="label label-info">{{ filename }}</span>
-    </a>
-  {% endfor %}
-
-{% endif %}
-
-{{ content }}

docs_theme/base.html

@@ -118,7 +118,15 @@ a.fusion-poweredby {
           </div>
 
           <div id="main-content" class="span9">
-            {% include "content.html" %}
+            {% if meta.source %}
+              {% for filename in meta.source %}
+                <a class="github" href="https://github.com/tomchristie/django-rest-framework/tree/master/rest_framework/{{ filename }}">
+                  <span class="label label-info">{{ filename }}</span>
+                </a>
+              {% endfor %}
+            {% endif %}
+
+            {{ content }}
           </div><!--/span-->
         </div><!--/row-->
       </div><!--/.fluid-container-->